Active heat dissipation X-ray bulb tube driven to rotate by external motor
By using an external motor to drive the rotation of the active cooling method, the anode target is exposed in insulating cooling oil and the oil flow is agitated by the paddle blades for heat dissipation. This solves the problem of insufficient heat dissipation in traditional X-ray tubes, achieves efficient heat dissipation, and avoids damage to the target surface.
Patent Information
- Application Number
- CN202422923721.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-11-28
AI Technical Summary
Traditional high-power X-ray tubes operate in a vacuum environment, with heat transfer to the target surface relying primarily on bearing heat conduction and radiation. This results in a small heat conduction area and insufficient heat dissipation capacity, leading to a rapid increase in target surface temperature and potential damage.
An active cooling method driven by an external motor is adopted. The side of the anode target away from the cavity is exposed on the outside of the shell and exposed to the insulating cooling oil. Combined with the agitation of the insulating oil by the paddle blades, heat dissipation is achieved, shortening the heat transfer path. The cathode assembly is kept in place by a power supply induction coil and a strong magnet, thus achieving efficient heat dissipation.
It effectively shortens the heat transfer path, improves the heat dissipation capacity of the anode target, avoids a sharp rise in target surface temperature, ensures continuous operation of the tube, and prevents target surface damage.
Smart Images
Figure CN223598665U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to X ray technical field, concretely relates to a kind of active heat dissipation X ray bulb of external motor drive rotation. BACKGROUND
[0002] X ray bulb is the core component of X ray generator, in its working process, electron beam with high energy is bombarded on metal target disc, except that a small part of energy is dissipated in the form of electromagnetic wave, most of energy becomes heat.The heat will be absorbed by target disc, if the heat cannot be dissipated in time, then target surface temperature will sharply increase, at this time, work needs to be stopped, if work cannot be stopped in time, even lead to target surface damage.
[0003] Most of traditional high-power X ray bulbs adopt rotating anode mode to make full use of the heat capacity of target surface, improve continuous work and output capacity, but since the interior of bulb is vacuum state, heat transfer of target surface mainly relies on bearing heat conduction and radiation heat dissipation of target surface, and the heat conduction area is small, and the heat dissipation capacity is insufficient. UTILITY MODEL CONTENTS
[0004] Therefore, the utility model provides a kind of active heat dissipation X ray bulb of external motor drive rotation to solve the problem that the heat transfer of target surface mainly relies on bearing heat conduction and radiation heat dissipation of target surface in traditional high-power X ray bulb, and the heat conduction area is small, and the heat dissipation capacity is insufficient.
[0005] Firstly, the utility model provides a kind of active heat dissipation X ray bulb of external motor drive rotation, comprising:
[0006] Shell, inside being equipped with cavity, the cavity one end is open and is arranged;
[0007] Anode target, with the shell fixed and block the open end of the shell internal cavity;The anode target is away from the cavity side bare outside the shell;
[0008] Cathode assembly, installation in the shell inside and at the opposite side of the anode target;
[0009] Center shaft, with the anode target fixed, the center shaft is suitable for being connected with drive motor, and the shell and the anode target are rotated together by drive motor;
[0010] Wherein, the cathode assembly is configured to remain unchanged under the action of external force.
[0011] During the working process of the X-ray bulb, the electron beam with high energy bombards on the anode target. Except for a small part of energy which is emitted in the form of electromagnetic wave, most of the energy is changed into heat. These heat will be absorbed by the anode target. If these heat cannot be removed in time, the temperature of the target surface will increase rapidly. At this time, the work needs to be stopped. If the work cannot be stopped in time, the target surface will be damaged. In the embodiment, the anode target is arranged to be exposed on the outside of the shell on the side away from the cavity. Therefore, the exposed side of the anode target is exposed to the insulating cooling oil. The target surface can be rapidly cooled by the oil, and the heat transfer path is greatly reduced.
[0012] In an alternative embodiment, the cathode assembly comprises:
[0013] A bulb cathode is arranged inside the shell.
[0014] A cathode shaft penetrates the shell, and two ends of the cathode shaft are respectively arranged on the inside and outside of the shell.
[0015] Two power supply slip rings are respectively electrically connected with the two ends of the cathode shaft, and the bulb cathode is electrically connected with the power supply slip ring arranged on the inside of the shell.
[0016] The bulb cathode is used for bombarding the electron beam with high energy on the anode target. The cathode shaft has a conductive effect. The cathode shaft penetrates the right end of the shell, and the cathode shaft is fixed and sealed with the shell at the penetration position. Two power supply slip rings are respectively electrically connected with the two ends of the cathode shaft. The power supply slip ring arranged on the outside is electrically connected with an external power supply. The two power supply slip rings are electrically connected through the cathode shaft. The bulb cathode is electrically connected with the power supply slip ring arranged on the inside of the shell. Then, the bulb cathode is powered through the power supply slip ring arranged on the outside, the cathode shaft and the power supply slip ring arranged on the inside.
[0017] In an alternative embodiment, the cathode assembly comprises a bulb cathode arranged inside the shell.
[0018] The central shaft is rotationally connected with the bulb cathode after penetrating the anode target. The bulb cathode is internally provided with an induction coil.
[0019] A power supply induction coil is arranged on the outside of the shell and fixed in position. The power supply induction coil is arranged on one side of the induction coil. The bulb cathode is internally provided with an induction coil. The power supply induction coil is arranged in the corresponding space outside the bulb. The power supply is realized through the induced current. The control signal can also be wirelessly transmitted, which is convenient for the control of the bulb cathode. The cathode does not need to be covered by an axis and then sealed. This is very helpful for the sealing and the maintenance of the vacuum.
[0020] In an alternative embodiment, a fixed position power supply induction coil is arranged outside the shell, and the power supply induction coil is arranged on one side of the induction coil.
[0021] In an alternative embodiment, a fixed position strong magnet is arranged outside the shell, and the strong magnet is arranged on one side of the tube cathode to apply a force to the tube cathode to keep the position of the tube cathode fixed.
[0022] In an alternative embodiment, the active heat dissipation X-ray tube driven to rotate by an external motor further comprises a paddle, which is arranged outside the shell and fixedly connected with the central shaft.
[0023] By arranging the paddle outside the shell and fixedly connected with the central shaft, when the driving motor drives the shell and the anode target to rotate through the central shaft, the paddle can rotate with the central shaft, and the rotation of the paddle can agitate the insulating oil around the paddle, so that the insulating oil flushes the outside of the anode target, and the heat dissipation capacity of the anode target is improved.
[0024] In an alternative embodiment, the active heat dissipation X-ray tube driven to rotate by an external motor further comprises a bearing, which is arranged outside the shell and sleeved on the surface of the central shaft.
[0025] In an alternative embodiment, the tube cathode is arranged on the edge side of the shell.
[0026] In an alternative embodiment, the cathode shaft is sealed at the through hole of the shell.
[0027] The utility model provides a kind of active heat dissipation X-ray tube driven to rotate by external motor, with following advantages:
[0028] 1.The utility model provides a kind of active heat dissipation X-ray tube driven to rotate by external motor, including shell, anode target, cathode assembly and central shaft, the cavity is arranged in the shell interior, the cavity one end is set as open setting;Anode target is fixed with the shell and blocks the open end of the cavity in the shell interior;The anode target is exposed on the outside of the shell on the side away from the cavity;Cathode assembly is installed in the shell interior and is on the opposite side of the anode target;Central shaft is fixed with the anode target, the central shaft is suitable for being connected with driving motor, and the shell and the anode target are driven to rotate by the driving motor;Wherein, the cathode assembly is configured to keep the position unchanged under the action of external force.
[0029] The active heat dissipation X-ray bulb driven by the external motor rotates, and the high-energy electron beam is bombarded on the anode target during the working process of the X-ray bulb.
[0030] 2. The active heat dissipation X-ray bulb driven by the external motor rotates, and the cathode assembly comprises:
[0031] The bulb cathode is arranged in the shell.
[0032] The cathode shaft penetrates the shell and is arranged on the inner and outer sides of the shell.
[0033] Two power supply slip rings are electrically connected with the two ends of the cathode shaft, and the bulb cathode is electrically connected with the power supply slip ring arranged on the inner side of the shell.
[0034] The active heat dissipation X-ray bulb driven by the external motor rotates, the bulb cathode is used for bombarding the high-energy electron beam on the anode target, the cathode shaft has a conductive effect, the cathode shaft penetrates the right end of the shell body, the cathode shaft is fixed and sealed with the shell body at the penetration position, the two power supply slip rings are electrically connected with the two ends of the cathode shaft, the power supply slip ring arranged on the outside is electrically connected with the external power supply, the two power supply slip rings are electrically connected through the cathode shaft, the bulb cathode is electrically connected with the power supply slip ring arranged on the inside of the shell body, and the bulb cathode is powered through the power supply slip ring arranged on the outside, the cathode shaft and the power supply slip ring arranged on the inside.
[0035] 3. The active heat dissipation X-ray bulb driven by the external motor rotates, and the cathode assembly comprises a bulb cathode arranged in the shell.
[0036] The center shaft is rotatably connected with the bulb cathode after penetrating the anode target, and the bulb cathode is internally provided with an induction coil. The shell is provided with a power supply induction coil fixed in position on the outer side of the shell, and the power supply induction coil is arranged on one side of the induction coil.
[0037] The active heat dissipation X-ray bulb driven by the external motor rotation is characterized in that a fixed power supply induction coil is arranged outside the shell and on one side of the induction coil, an induction coil is arranged at the cathode of the bulb, a power supply induction coil is arranged in the corresponding space outside the bulb, power supply is realized through the induction current, the control signal can be wirelessly transmitted, and the cathode of the bulb is controlled.
[0038] 4. The active heat dissipation X-ray bulb driven by the external motor rotation is characterized in that a paddle is further arranged outside the shell and is fixedly connected with the central shaft.
[0039] The active heat dissipation X-ray bulb driven by the external motor rotation is characterized in that the paddle is arranged outside the shell and is fixedly connected with the central shaft, the paddle can rotate with the central shaft when the driving motor drives the shell and the anode target to rotate together, the paddle stirs the insulating oil around the paddle, the insulating oil flushes the outside of the anode target, and the heat dissipation capacity of the anode target is improved. BRIEF DESCRIPTION OF DRAWINGS
[0040] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0041] Figure 1 The structure schematic view of the active heat dissipation X-ray bulb driven by the external motor rotation provided in the embodiment 1 of the present application is shown in the figure.
[0042] Figure 2 The internal structure schematic view of the active heat dissipation X-ray bulb driven by the external motor rotation provided in the embodiment 1 of the present application is shown in the figure.
[0043] Figure 3 The structure schematic view of the active heat dissipation X-ray bulb driven by the external motor rotation provided in the embodiment 2 of the present application is shown in the figure.
[0044] Figure 4 The internal structure schematic view of the active heat dissipation X-ray bulb driven by the external motor rotation provided in the embodiment 2 of the present application is shown in the figure.
[0045] Explanation of reference signs:
[0046] 1 - shell;
[0047] 2-anode target;
[0048] 3-center axis;
[0049] 4-bulb cathode;
[0050] 5-cathode axis;
[0051] 6-power supply slip ring;
[0052] 7-strong magnet;
[0053] 8-paddle. DETAILED DESCRIPTION
[0054] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0055] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.
[0056] Embodiment 1
[0057] The X-ray bulb is the core component of the X-ray generator. In its working process, the electron beam with high energy bombards on the metal target disc. Except for a small part of energy being dissipated in the form of electromagnetic wave, most of the energy becomes heat. These heat will be absorbed by the target disc. If these heat cannot be dissipated in time, the temperature of the target surface will rise sharply. At this time, work needs to be stopped. If work cannot be stopped in time, even the target surface will be damaged.
[0058] Most of the traditional high-power X-ray bulbs adopt the rotating anode mode to fully utilize the heat capacity of the target surface and improve the continuous working and output capacity. However, since the inside of the bulb is in a vacuum state, the heat transfer of the target surface mainly relies on the bearing heat conduction and the radiation heat dissipation of the target surface. The heat conduction area is small, and the heat dissipation capacity is insufficient.
[0059] Therefore, as shown in Figure 1 and Figure 2 The embodiment provides an active heat dissipation X-ray tube driven by an external motor to solve the problem of insufficient heat dissipation capacity of a traditional high-power X-ray tube.
[0060] In the embodiment, the active heat dissipation X-ray tube driven by an external motor comprises a shell 1, an anode target 2, a central shaft 3, a cathode assembly 4, a cathode shaft 5, a power supply slip ring 6, a strong magnet 7 and a paddle 8.
[0061] Figure 1 The embodiment provides an active heat dissipation X-ray tube driven by an external motor to solve the problem of insufficient heat dissipation capacity of a traditional high-power X-ray tube. Figure 2 The embodiment provides an active heat dissipation X-ray tube driven by an external motor to solve the problem of insufficient heat dissipation capacity of a traditional high-power X-ray tube. As shown in Figure 1 and Figure 2 The embodiment provides an active heat dissipation X-ray tube driven by an external motor to solve the problem of insufficient heat dissipation capacity of a traditional high-power X-ray tube. As shown in
[0062] Specifically, in the embodiment shown in Figure 2 The left end of the shell 1 is an open end, and the left end open end is provided with an open side wall. The anode target 2 is annular, and the anode target 2 is placed in the shell 1 and fixedly connected with the open side wall of the left end open end. The outer diameter of the anode target 2 is greater than the inner diameter of the left end open end of the shell 1, so that the open side wall of the left end open end can be bent after the anode target 2 is placed in the shell 1 during production. The cathode assembly is installed in the shell 1 and located at the right end of the shell 1. The cathode assembly is not fixed with the inner wall of the shell 1, so that the cathode assembly remains unchanged under the action of external force during the rotation of the shell 1. The cathode assembly works to bombard the anode target 2 with a high-energy electron beam. The central shaft 3 is fixed with the anode target 2, and the central shaft 3 is connected with the driving motor. The driving motor drives the shell 1 and the anode target 2 to rotate through the central shaft 3. At the same time, the cathode assembly remains unchanged under the action of external force, so that the position of the cathode assembly is fixed, and the position of the cathode electron beam is fixed.
[0063] As can be seen from the above analysis, in the working process of the X-ray tube, the electron beam with high energy bombards the anode target 2. Except for a small part of energy being emitted in the form of electromagnetic wave, most of the energy is converted into heat. The heat is absorbed by the anode target 2. If the heat cannot be dissipated in time, the temperature of the target surface will rise sharply. At this time, the work needs to be stopped. If the work cannot be stopped in time, the target surface will be damaged. In the embodiment, the anode target 2 is arranged to be exposed to the outside of the shell 1 on the side away from the cavity. Therefore, the exposed side of the anode target 2 is exposed to the insulating cooling oil. The target surface can be rapidly cooled by the oil, and the heat transfer path is greatly shortened.
[0064] In the embodiment, the cathode assembly includes the tube cathode 4, the cathode shaft 5, and two power supply slip rings 6. The tube cathode 4 is arranged inside the shell 1. The cathode shaft 5 penetrates the shell 1, and the two ends of the cathode shaft 5 are respectively located on the inside and outside of the shell 1. The two power supply slip rings 6 are respectively electrically connected to the two ends of the cathode shaft 5, and the tube cathode 4 is electrically connected to the power supply slip ring 6 located on the inside of the shell 1.
[0065] In the above structure, the tube cathode 4 is used to bombard the anode target 2 with an electron beam with high energy. The cathode shaft 5 has a conductive effect. The cathode shaft 5 penetrates the right end of the shell, and the cathode shaft 5 is fixed and sealed with the shell at the penetration position. The two power supply slip rings 6 are respectively electrically connected to the two ends of the cathode shaft 5. The power supply slip ring 6 located on the outside is electrically connected to the external power supply. The two power supply slip rings 6 are electrically connected through the cathode shaft 5. The tube cathode 4 is electrically connected to the power supply slip ring 6 located on the inside of the shell. Then, the tube cathode 4 is powered through the power supply slip ring 6 located on the outside, the cathode shaft 5, and the power supply slip ring 6 located on the inside.
[0066] In the embodiment, as shown in Figure 1 and Figure 2 , a fixed-position strong magnet 7 is arranged on the outside of the shell 1. The strong magnet 7 is arranged on the side of the tube cathode 4 to exert a force to keep the position of the tube cathode 4 fixed. The above-mentioned method of using the strong magnet 7 to fix the position of the tube cathode 4 is a prior art. In the embodiment, it is directly used, and therefore the principle thereof will not be described in detail.
[0067] In the embodiment, as shown in Figure 1 and Figure 2 , the paddle 8 is arranged on the outside of the shell 1 and is fixedly connected with the central shaft 3. By arranging the paddle 8, and arranging the paddle 8 on the outside of the shell 1 and fixedly connecting the paddle 8 with the central shaft 3, when the driving motor drives the shell 1 and the anode target 2 to rotate together through the central shaft 3, the paddle 8 can rotate together with the central shaft 3. Then, the paddle 8 stirs the insulating oil around it through rotation, so that the insulating oil flushes the outside of the anode target 2, and the heat dissipation capacity of the anode target 2 is improved.
[0068] In the embodiment, a bearing can also be sleeved on the surface of the central shaft 3, the bearing is outside the shell 1 and in the insulating oil, the bearing can be fixed with external components, the stability of the central shaft 3 can be improved by arranging the bearing, and the bearing is arranged in the insulating oil, so that the cooling of the bearing can be accelerated.
[0069] In the embodiment, as shown in Figure 1 and Figure 2 , the ball tube cathode 4 is at the edge side of the shell 1.
[0070] The active heat dissipation X-ray ball tube driven by the external motor provided in the embodiment rotates, and the working process is as follows:
[0071] The driving motor drives the shell 1 and the anode target 2 to rotate together through the central shaft 3, and the ball tube cathode 4 is fixed in position by the force applied by the strong magnet 7 outside the shell 1. The ball tube cathode 4 is electrically connected with the external power supply through the power supply slip ring 6 inside and the power supply slip ring 6 outside, and the cathode assembly will bombard the anode target 2 with a high-energy electron beam during the working process. At the same time, the anode target 2 is exposed to the insulating cooling oil away from the cavity side, and the target surface can be quickly cooled by the oil, greatly reducing the heat transfer path. When the driving motor drives the shell 1 and the anode target 2 to rotate together through the central shaft 3, the paddle 8 can rotate together with the central shaft 3, and then the insulating oil around the paddle 8 is stirred by the rotation of the paddle 8, so that the insulating oil washes the outside of the anode target 2, improving the heat dissipation capacity of the anode target 2.
[0072] Embodiment 2
[0073] The active heat dissipation X-ray ball tube driven by the external motor provided in the embodiment rotates, and the working process is as follows:
[0074] Figure 3 The active heat dissipation X-ray ball tube driven by the external motor provided in the embodiment rotates, and the working process is as follows: Figure 4 The active heat dissipation X-ray ball tube driven by the external motor provided in the embodiment rotates, and the working process is as follows:
[0075] In the embodiment, as shown in Figure 3 and Figure 4 , the ball tube cathode 4 is at the edge side of the shell 1.
[0076] By setting the central shaft 3 through the anode target 2 and rotatingly connecting with the ball tube cathode 4, specifically, a bearing can be set between the central shaft 3 and the ball tube cathode 4, so that the ball tube cathode 4 can still keep position fixed under the action of the strong magnet 7 during the rotation of the central shaft 3, and the cathode electron beam position is ensured to be fixed.
[0077] In the embodiment, the fixed power supply induction coil is arranged outside the shell 1, and the power supply induction coil is arranged on one side of the induction coil. The induction coil is arranged in the ball tube cathode 4, and the power supply induction coil is arranged in the corresponding space outside the ball tube. The power supply is realized through the induction current, and the control signal can also be wirelessly transmitted, so as to facilitate the control of the ball tube cathode 4. Compared with the scheme in the embodiment 1, the cathode does not need to be coated with a shaft and then sealed, which is very helpful for sealing and vacuum keeping.
[0078] The active heat dissipation X-ray ball tube driven by the external motor provided in the embodiment has the following working process:
[0079] The driving motor drives the shell 1 and the anode target 2 to rotate through the central shaft 3, and the ball tube cathode 4 keeps position fixed by the force of the strong magnet 7 outside the shell 1. The ball tube cathode 4 is powered through the induction current by the induction coil arranged in the ball tube cathode 4 and the power supply induction coil arranged in the corresponding space outside the ball tube. The cathode assembly works in the process of bombarding the anode target 2 with the high-energy electron beam. At the same time, the anode target 2 is exposed to the insulating cooling oil on the side away from the cavity, and the target surface can be quickly cooled by the oil, greatly reducing the heat transfer path. When the driving motor drives the shell 1 and the anode target 2 to rotate through the central shaft 3, the paddle 8 can rotate with the central shaft 3, and the insulating oil around the paddle 8 is stirred by the rotation of the paddle 8, so that the insulating oil flushes the outside of the anode target 2, improving the heat dissipation capacity of the anode target 2.
[0080] Obviously, the above embodiments are only examples for clearly illustrating, and are not limitation to the embodiments. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments do not need to be exhausted, and the obvious changes or variations still fall within the protection scope of the present application.
Claims
1. An actively cooled X-ray tube with an externally driven motor for rotation, characterized in that, include: The outer shell (1) has an internal cavity, one end of which is open; An anode target (2) is fixed to the outer shell (1) and seals the opening end of the cavity inside the outer shell (1); the side of the anode target (2) away from the cavity is exposed on the outside of the outer shell (1); The cathode assembly is installed inside the housing (1) and is located on the opposite side of the anode target (2); A central shaft (3) is fixed to the anode target (2). The central shaft (3) is adapted to be connected to a drive motor and drives the outer shell (1) and the anode target (2) to rotate together through the drive motor. The cathode assembly is configured to remain in a fixed position under the action of an external force.
2. The actively cooled X-ray tube driven by an external motor for rotation according to claim 1, characterized in that, The cathode assembly includes: The X-ray tube cathode (4) is disposed inside the outer casing (1); A cathode shaft (5) passes through the outer shell (1) and its two ends are located on the inner and outer sides of the outer shell (1), respectively. Two power supply slip rings (6) are electrically connected to both ends of the cathode shaft (5), and the tube cathode (4) is electrically connected to the power supply slip rings (6) located inside the outer casing (1).
3. The actively cooled X-ray tube driven by an external motor for rotation according to claim 1, characterized in that, The cathode assembly includes a x-ray tube cathode (4), which is disposed inside the outer casing (1); The central shaft (3) passes through the anode target (2) and is rotatably connected to the tube cathode (4), which has a built-in induction coil.
4. The actively cooled X-ray tube driven by an external motor for rotation according to claim 3, characterized in that, The outer side of the outer casing (1) is provided with a fixed power supply induction coil, which is located on one side of the induction coil.
5. The externally driven, actively cooled X-ray tube according to claim 2 or 3, characterized in that, The outer shell (1) is provided with a fixed strong magnet (7) on the outside. The strong magnet (7) is located on one side of the X-ray tube cathode (4) to apply a force to the X-ray tube cathode (4) to keep the X-ray tube cathode (4) fixed in position.
6. The actively cooled X-ray tube driven by an external motor for rotation according to claim 5, characterized in that, It also includes a blade (8), which is located outside the housing (1) and fixedly connected to the central shaft (3).
7. The actively cooled X-ray tube driven by an external motor for rotation according to claim 5, characterized in that, It also includes a bearing, which is located outside the housing (1) and sleeved on the surface of the central shaft (3).
8. The actively cooled X-ray tube driven by an external motor for rotation according to claim 5, characterized in that, The cathode (4) of the X-ray tube is located on the edge side of the outer casing (1).
9. The actively cooled X-ray tube driven by an external motor for rotation according to claim 2, characterized in that, The cathode shaft (5) is sealed at the point where it passes through the outer casing (1).